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REP09159
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REP09159
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Last modified
8/24/2016 11:38:51 PM
Creation date
11/27/2007 12:03:40 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980005
IBM Index Class Name
Report
Doc Date
12/11/2001
Doc Name
1992 WATER YEAR ANNUAL HYDROLOGY REPORT SENECA II MINE
Annual Report Year
1992
Permit Index Doc Type
HYDROLOGY REPORT
Media Type
D
Archive
No
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• will be used by wildlife. Livestock water quality standard exceedences (for magnesium and <br />chlorides) are expected to curtail when the use of chemical road Treatment stops. <br />Occasional high pH values may periodically continue, as they are likely a result of <br />natural occurring algal blooms. Peabody questions whether the observations of exceedences <br />for the rigid livestock standards truly indicate potential harm to livestock or uildLife <br />should they drink water from [he stock tanks. <br />Comparison of Su rfece Water Quality to Yeter Use Standards. The CDOH has recently revised <br />established water quality standards for most stream segments in the state, including the <br />Yampa River and select tributaries (CDOH, 1992). Surface water in the Grassy Creek Basin <br />is categorized under Segment 12 of the Yampa River, end this segment has only minimal <br />standards established (dissolved oxygen, pH, and fecal coliforms only). Surface eater in <br />the Fish Creek Basin (Cow Camp and Bond Creeks) is categorized under Segment 138. The <br />standards for Segment 13B vary from those used in prior Annual Hydrology Reports. Those <br />changes ere noted in Table 24 (Appendix A). Standards for certain trace metals and <br />ammonia now involve the use of a "Table Value Standard" (TVS) which involves the use of a <br />l ogarthmic equation that uses hardness values (for trace metals) or temperature and pH <br />• (for ammonia). Regardless, the standards that existed prior to the implementation of the <br />TVS's are used to evaluate water quality of discharges into the Fish Creek Basin. <br />For Segment 13B of the Yampa River, the CDOH has established a standard of 0.02 mg/l for <br />un-ionized ammonia (as nitrogen). Analyses performed by Peebody's contract laboratory for <br />ammonia as nitrogen resulted in reported values consisting of the sum of both the ammonium <br />ion (ionized) and ammonia (un-ionized). Because of this, it was necessary to convert <br />Peabody's reported ammonia concentrations to un-ionized ammonia concentrations in order to <br />compare them against the stream standard. The table presented on Page 713 of "Standard <br />Methods for the Examination of Water and Yastewater" (APHA, 1985) presents percent <br />correction factors used to calculate unionized portions of ammonia in distilled water. <br />Since percent correction factors for solutions with higher TDS are unavailable in the <br />literature, percent correction factors for distilled water were applied to the ammonia <br />values for comparison purposes. It should be noted that the percent un-ionized ammonia <br />decreases with increasing TDS, and resultant values calculated for un-ionized ammonia are <br />probably higher then the true value. <br />L 11 <br />L_ ) <br />25 <br />
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